Spray nozzle



March 10, 1931. w. H. SCHNEIDER 1,795,898

' SPRAY NOZZLE Filed Dec. 6, 1926 1 Z 0| 7- I '[6 l 2Q i f.

59 6 INVENTOIR.

.1 wmfi W 2 7 28 I By A TTORNEY.

valve.

Patented Mar. 10, 1931 messes PATENT oFFicE WILLIAM H. SCHNEIDER, FMILWAUKEE, WISCONSIN SPRAY NOZZLE Application. filed December 6,1926Serial No. 152,927.

. The invention relates tospray nozzles, and more particularly" to spraynozzles for use in connection with carburettors although not necessarilylimited thereto. 1

In the-majority of carburettors in use today the, flow of fuel to themixing chamber or passage is controlled by a nozzle whose dischar eorifice is regulated by a needle hile these needle valves areadjustable, they are generally set to effect a compromise to suit mostrunning conditions of the motor and the result is that the fuel isnot'as efliciently sprayed as it should be, which results in imperfectmixing and hence imperfect consumption. -The object of this invention isto improve the nozzle structure ofthe carburettor by providing for alarge area of fuel discharge and at the same time cause the fuel to'bedischarged in a fine film into the mixing chamber for efficient mixturewith the air on its way to the motor. More specifically, the inventionconsists in a nozzle formed by a coiled spring from whose closely spacedconvolutions the fuel enters or is sucked into the mixing chamber,

I preferably a Venturi passage.

; sion hereof. I

I shown in Fig. 1, parts being broken away;

Fig. 3 is a detail view of-a part of the nozzle; I

Fig. 4 is an enl'argedbottom view of the rod shown in Fig. 3; 7

Fig. 5 is a view similar to Fig. 2, showing a modification Fig. 6 is adetail sectional view taken on the line 66 of Fig. 3.

In Fig. 1 I have shown a carburettor having a float chamber 7 into whichthe fuel is introduced in any suitable manner, the float 8 beingoperatively connected to the usual supply valve (not shown), saidchamher being formed by a topv casing?) and a shell 10 clamped tothetubular extension 11 of said casing by a nut 12. a

The top casing 9 is provided with an air inlet passage 13, a Venturimixing chamber or passage 14, and an outlet passage 15 having thebutterfly throttle control valve 16 mounted therein, the extension 11having a fuel passage 17 formed therein communicatingbypassages 18 withthe interior of the filoat-chamber and conducting fuel to the nozz e.

Thenozzle embodying the invention comprises, in each instance, a coilspring 19, preferably of square or rectangular cross section to presentflatdischarge surfaces, and means are provided for holding this springin operative position at the upper end of the pas sage 17 and so as toextend into the mixing passage 14. While the spring may seat directlyupon the upper end of the passage 17, 1 preferably, in eachinstance,secure an annular member 20 to its lower end by soldering it thereto andprovide said member with a conical face 21 engageable with a concialseat 22 at the upper end of the passage 17.

Forholdingthe spring 19 in operating position, I have'shown, in Figs. 1to 4, inclusive, a, rod 23 having a threaded portion 24 engageable inthe threaded opening 25 in the cap 26 secured to the casing 9 andprovided with a fluted extension 27 of less diameter extending downthrough the spring and the openingin the member 20 and projecting intothe'upper end of the passage 17, said stem having grooves -28,best shownin Fig. 4.

The upper end of the spring 19 is secured, as by soldering, to anapertured or screenlike memberv 29 and a spring 30 is interposed betweensaid disk and a shoulder 31, formed on the rod 23, said spring 30 beingsoldered to 1 carburettor, as'shown in Fig. 1, turning of the rod in aclockwise direction will shorten the distance between the shoulder 31and the member 20, the extension 17 being free to move lengthwisetherein, with the result that the springs 19 and 30 are compressed untilthe coils of the spring 19 are brought so close- 1y together as to leavea very fine helical discharge opening therebetween, with the result thatwhen the fuel is drawn by the suction of the air through the spacebetween the coils it will be discharged therefrom in a thin film thatwill readily mix with the air passing through the Venturi passage 14. Asthe springs 19 and balance each other, the dish or member 29 is free tomove in the mixing passage, and for any initial setting of the nozzleunit an increase of air supply through a speeding up of the motor willcause an upward movement of the disk 29 with the result that the spring30 is compressedsomewhat charge opening between the convolutions of thespring, and a decrease in suction will again cause the member 29 to moveback to its initial position and thus cut down the effective nozzledischarge opening. Thus, the discharge area of the nozzle may bevariedunder varying demands of the motor.

In order, however, to simplify the construction, I may omit theautomatic nozzle area regulatin feature by omitting the mem= ber 29 andspring 30, and such aconstruction is shown in Fig. 5, wherein the upperend'of the spring 19 is soldered direct toa shoulder 32 of a rod 33having athreaded portion 34 which is designed to engage the threadedopening 25 in the same manner as the rod 23, said rod having a flutedextension 35 extending down through the spring and projecting into theupper end of the passage 17fwhen the nozzle is in assembled position inthe carburettor, and when sozassembled the spring 19 of the structureshown in Fig. 5 occupies the same position as the similar spring 19 ofthe unit shown in Fig. 1.

Assuming then that the nozzle shown in Fig. 5 is mounted in the Venturipassage 14, it will be noted that as the air flows up through saidpassage, under engine suction, fuel from the passage 17 willbe drawn upthrough the grooves in the fluted extension into the interior of thespring and will then pass through the very narrow but long helicalpassage formed between the convolutionsof the spring19 and be dischargedtherefrom into the air in passage, and since the adjustment of the rod3a in the proper direction serves to d crease the length of the springthe space between the convolutions may be made very fine so that afilnilike dischar e is assured hence the fuel. mines readily. with the.air. Furthermore, as the total length of discharge opening is relativelylarge, efiicient mixtures are. formed under varying motor-operatingconditions since on a decrease of. velocity of air through the passage.14 less the discharge be effective for active fuel discha at higherspeeds. In order, however, where conditions require it, to vary thenozzle area ith varying speeds, I have provided the first-describedconstruction.

I desire it to be understood that this invention is not to be limited toany specific form or arrangement of parts except in so far as suchlimitations are specified in the claims.

What I claim as my invention is:

1. In carburettor, the combination with the mixing passage, of a fuelnozzle comprising, a coiled resilient member for delivering fuel to themixing chamber, said member having closelyspaced convolutions, andseparate means for supplying air to said mixing passage. V

2. In a carburettor, the combination with the mixing passage, of a fuelnozzle comprising a coiled spring. for-delivering fuelitothe 'ngchamber, and means for adjusting said spring to space its convolutionsfor etficient fuel dlstribution therebetween, and

separate means for supplying air to said mixpassage. 3. In acarburettor, the combination with the Venturi mixin passage, of a coilspring positioned in said passageand'having itsia terior communicatingwith the fuel supply and its coil closely spacedtoform a' fueldischarge'nozzle, and separate means for supplying air to said Venturipassage.

a. In a carburettor, the combination with if the casing, the Venturimixing passage, and the fuel supply conduit tosaid'passa'ge, of a springhaving a seat member seated on the upper end of said conduit, a rodassociated with said spring and adjustably mounted'on said casing tohold said spring in operative fuel nozzle-forming position in saidmixing passage, and separate means for supplying air to saidmixing'passage.

5. In a carburettor, the combination with V a mixing passage, of-a. coilspring positioned in said passage and'having its inteniorcommunicatingwith the fuel supply and its coils closely spaced to form a fueldischarge nozzle, means responsive to pressure changes in said chamberfor varying the effective length of saidspring to vary its nozzledischarge area, and separate means for supplying air to said mixingpassage.

6. In a carburettor, the combination-with the mixing passage, of'a coilspring positioned 1n said passage and hav ng 1ts interior communlcatingwith the fuel supply. and its coils closely spaced to form a fueldischarge nozzle, means including a shiftabledisk'responsive to pressurechanges in saidchamber for varying the effectivelength of said spring tovary its nozzle discharge area,rand separate means for supplying air tosaidmixing passage.

In a carburettor, the combination'with the mixing passage, of acoilspring positioned in said passage, a fuel supply conduitcommunicating directly 'with the interior of said spring, and adjustablespring tensioning-means having a fluted extension fitting within saidspring and extending into said conduit.

8. In a carburettor, the combination with the mixing passage, of a coilspring positioned in said passage and having its interior communicatingdirectly with the fuel supply and its coils closely spaced to form afuel discharge nozzle, a spring, a shiftable disk interposed betweensaid nozzle spring and said last-named spring and responsive to pressurechanges in said chamber for varying the effective length of said nozzlespring to vary its nozzle discharge area, and a centering member forsaid disk and springs.

9. In a carburettor, the combination'with the mixing passage, of a coilspring posi tioned in said passage, a fuel supply conduit communicatingdirectly with the interior of said spring, and adjustable spring-tensioning means having an extension fitting within said spring and providedwith a fuel-distributing passage communicating with said conduit. I Intestimony whereof, I afi'ix my signature.

WILLIAM I-IJ SCHNEIDER.

